S10 Blazer BD on 20's

I have a blazer BD on 20's all the way around it takes all the front can hold for me to clear the fender to turn I talked to someone this weekend he said all he had was fill his front a lil to turn so what size cup to I need to switch too I have ART cups now? and also does anyone know how close a s10 cal combo would come to fitting my blazer?